Hydraulic Behavior Of Piano Key Weir Type B Under Free Flow Conditions
Journal: International Journal of Scientific & Technology Research (Vol.5, No. 3)Publication Date: 2016-03-15
Authors : Saleh Issa Khassaf; Laith Jawad Aziz; Zainab Ahmed Elkatib;
Page : 158-163
Keywords : Piano Key Weir; Physical modeling; Free Flow; Discharge coefficient; Type B.;
Abstract
In this study laboratory experiments were performed to evaluate the effects of the weir geometry of a Piano Key Weir PKW type B on the discharge coefficient under free flow conditions. Experiments were conducted in a 15m long 0.3m wide and 0.45m deep rectangular glass-walled flume. The experimental work includes testing of fourteen PKW models which results 290 tests to cover the effects of weir length and height up-and downstream key widths upstream apex overhangs length dam height and noses length on the weir flow discharge coefficient as well PKW with outlet stepped key were considered in the analysis. Considering the experimental data the dimensional analysis allowed the development of relations between discharge coefficient and the shape of the PKW and gave a good agreement. Experimental results showed that the most influential parameters for the tested PKW models are the Relative length LW Key widths Wi268260Wo PKW Height BP and Overhangs length Bo268260B. The effectiveness of Piano Key Weir at low heads ratio HP0.25 is up to 400 relative to Creager weir at the same head.
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